Using regex with run-parts on Alpine 3.9 - regex

Question

I'm creating a Docker image FROM alpine:3.9.2 and I need to run run-parts. I used the script below in the past on ubuntu:16.04 without problems.
run-parts --verbose --regex '\.sh$' "$DIR"
However, this time around, I get errors on the options I pass to it. I.e.
run-parts: unrecognized option: verbose
run-parts: unrecognized option: regex
From my understading Alpine 3.9.2 uses run-parts 4.8.6 https://pkgs.alpinelinux.org/package/edge/main/x86/run-parts which should come from the debianutils https://manpages.debian.org/testing/debianutils/run-parts.8.en.html and supports both verbose and regex.
Am I missing anything here?
how can I run all the files ending with .sh on Alpine 3.9.2?

Answer 1

There is very cut version of run-parts in alpine image by default. It is busybox one:
/ # which run-parts
/bin/run-parts
/ # run-parts --help
BusyBox v1.29.3 (2019-01-24 07:45:07 UTC) multi-call binary.
Usage: run-parts [-a ARG]... [-u UMASK] [--reverse] [--test] [--exit-on-error] DIRECTORY
Run a bunch of scripts in DIRECTORY
-a ARG Pass ARG as argument to scripts
-u UMASK Set UMASK before running scripts
--reverse Reverse execution order
--test Dry run
--exit-on-error Exit if a script exits with non-zero
It can only run a bunch of scripts in directory.
If you want to use uncut run-parts from the debianutils package, you need to install it first to alpine image:
/ # apk add --no-cache run-parts
fetch http://dl-cdn.alpinelinux.org/alpine/v3.9/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.9/community/x86_64/APKINDEX.tar.gz
(1/1) Installing run-parts (4.8.6-r0)
Executing busybox-1.29.3-r10.trigger
OK: 6 MiB in 15 packages
Now, there is a full version of run-parts in alpine instance:
/ # which run-parts
/usr/bin/run-parts
/ # run-parts --help
Usage: run-parts [OPTION]... DIRECTORY
--test print script names which would run, but don't run them.
--list print names of all valid files (can not be used with
--test)
-v, --verbose print script names before running them.
--report print script names if they produce output.
--reverse reverse execution order of scripts.
--exit-on-error exit as soon as a script returns with a non-zero exit
code.
--lsbsysinit validate filenames based on LSB sysinit specs.
--new-session run each script in a separate process session
--regex=PATTERN validate filenames based on POSIX ERE pattern PATTERN.
-u, --umask=UMASK sets umask to UMASK (octal), default is 022.
-a, --arg=ARGUMENT pass ARGUMENT to scripts, use once for each argument.
-V, --version output version information and exit.
-h, --help display this help and exit.